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Speaking on Radio 5 Live he said: “I tried to prove it - but couldn't.

"I promised the person I sold it to that one day I would return and try and prove it and wonderfully, we were able to do it.

"We have proved that a painting that I bought for a few thousand pounds originally, hoping it was a work by one of the greatest landscape painters who ever lived, is now finally proved to be so. I am so thrilled.

"I'm enormously happy for him," he added.

"It's also wonderful for Constable himself. I had visions of him saying why is my picture being deemed a fake?"